import pygame
from pygame.sprite import Sprite

from 外星人入侵.game_functions import flag


class Ship(Sprite):

    def __init__(self,ai_settings,screen):
        """初始化飞船并设置初始位置"""
        super(Ship, self).__init__()
        self.screen = screen
        self.ai_settings = ai_settings
        print("sp = ", ai_settings.sp)
        # 加载飞船图像并获取其外接矩形
        # if ai_settings.op == 0:
        self.image = pygame.image.load('images/ship.png')
        # else:
        # # elif ai_settings.op == 2:
        #   self.image = pygame.image.load('images/ship3.png')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        # 将每艘新飞船放在屏幕底部中央
        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom

        #在飞船的属性center1,center2中储存小数值
        self.center1=float(self.rect.centerx)
        self.center2=float(self.rect.centery)
        
        #移动标志
        self.moving_right=False
        self.moving_left=False
        self.moving_down = False
        self.moving_up = False
        
    def update(self):
        """根据移动标志调整飞船的位置"""
        #更新飞船的center值，而不是rect
        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center1 +=self.ai_settings.ship_speed_factor
        if self.moving_left and self.rect.left > 0:
            self.center1 -=self.ai_settings.ship_speed_factor
        if self.moving_up and self.rect.top>self.screen_rect.top:
           self.center2-=self.ai_settings.ship_speed_factor
        if self.moving_down and self.rect.bottom<self.screen_rect.bottom:
           self.center2+=self.ai_settings.ship_speed_factor

        #根据self.center1,center2更新rect对象
        self.rect.centerx=self.center1
        self.rect.centery=self.center2
            

    def blitme(self):
        """在指定位置绘制飞船"""
        self.screen.blit(self.image, self.rect)

    def center_ship(self):
        """让飞船在屏幕上居中"""
        self.center1= self.screen_rect.centerx
        self.center2=self.screen_rect.bottom-30
